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290 results on '"Shen Yongjia"'

1. Synthesis, electropolymerization, and electrochromic performances of two novel tetrathiafulvalene–thiophene assemblies

Author

Li Yuhao, Deng Shixiong, Cai Pengfei, Wang Chenyun, Wang Han, and Shen Yongjia

Subjects
electrochromic, electropolymerization, polythiophene, tetrathiafulvalene, selective esterification, Polymers and polymer manufacture, TP1080-1185
Abstract

6,7-Bis(hexylthio)-2-[(2-hydroxyethyl)thio]-3-methylthio-tetrathiafulvalene (TTF-2) is coupled with thiophene-3-carboxylic acid and thiophene-3,4-dicarboxylic acid by Steglich esterification, respectively, to afford 2-((4′,5′-bis(hexylthio)-5-(methylthio)-[2,2′-bi(1,3-dithiolylidene)]-4-yl)thio)ethyl thiophene-3-carboxylate (TTF-Th) and bis(2-((4′,5′-bis(hexylthio)-5-(methylthio)-[2,2′-bi(1,3-dithiolylidene)]-4-yl)thio)ethyl)thiophene-3,4-di-carboxylate (DTTF-Th). Their structures were characterized by ESI-MS, 1H NMR, and elemental analysis. Electropolymerization of TTF-Th and DTTF-Th was conducted with 0.1 M n-Bu4NPF6. The results indicated that both assemblies could rapidly form polymers via electrochemical deposition. In addition, their electrochromic performances illustrated that the color of P(TTF-Th) could switch from orange-yellow to dark blue, while P(DTTF-Th) changed its color from orange in the neutral state to dark blue in the oxidation state. Moreover, the electrochromic performances of P(DTTF-Th) were better than P(TTF-Th) due to the introduction of one extra TTF unit.

Published
2020
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2. A Study on the Lighting Visual Comfort for Refrigerators with Different Volumes

Author

Ran, Linghua, Wu, Jian, Gui, Lin, Wang, Zhen, Wang, Zhongting, Shen, Yongjia, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Rebelo, Francisco, editor, and Soares, Marcelo, editor

Published
2020
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3. Review of the Research on Car Seating Comfort

Author

Fan, Xiaoli, Zhao, Chaoyi, Chen, Xuemei, Jiang, Yuwei, Shen, Yongjia, Shen, Tong, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Rebelo, Francisco, editor, and Soares, Marcelo M., editor

Published
2020
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44. Effect of neutral nickel catalyst on cure process of silicon-containing polyarylacetylene

Author

Lei Du, Qiaolong Yuan, Shen Yongjia, and Farong Huang

Subjects
inorganic chemicals, Materials science, organic chemicals, chemistry.chemical_element, Activation energy, urologic and male genital diseases, Condensed Matter Physics, Catalysis, chemistry.chemical_compound, Nickel, Differential scanning calorimetry, chemistry, Polymer chemistry, heterocyclic compounds, Thermal stability, Physical and Theoretical Chemistry, Triphenylphosphine, Fourier transform infrared spectroscopy, Instrumentation, Curing (chemistry), Nuclear chemistry
Abstract

The curing behavior of silicon-containing polyarylacetylene (PSA) with nickel acetylacetonate and triphenylphosphine (Ni(acac) 2 /PPh 3 ) as a catalyst was studied by differential scanning calorimetry (DSC), FTIR in situ monitoring and gel time analysis. The thermal stability of the cured PSA was performed on thermogravimeter. The results show that the catalytic effect of Ni(acac) 2 /PPh 3 on curing reaction of PSA is distinct. The peak temperature of cure reaction of PSA was decreased by 100 °C when the catalyst was added into the resin at a molar ratio of 100:1. The conversion ratio of the terminal alkynes in PSA cured with the catalyst is higher than that cured without catalyst during heating. The internal alkynes in PSA are apt to achieve when the catalyst is added in the early stage of curing process. The apparent activation energy of the gel process of PSA with the catalyst declined about 30%. The catalyst-added PSA was cured at lower temperature. The temperature at 5% mass loss and residual yield at 800 °C in N 2 of the cured PSA with the catalyst-added and catalyst-free are 615 °C and 89%, 618 °C and 90%, respectively.

Published
2014

50. Synthesis and thermal cure of diphenyl ethers terminated with acetylene and phenylacetylene

Author

Fan Wang, Jian Zhang, Farong Huang, Xu Jinfeng, Shen Yongjia, and Lei Du

Subjects
Polymers and Plastics, Diacetylene, Organic Chemistry, Diphenyl ether, chemistry.chemical_compound, Polymerization, chemistry, Acetylene, Phenylacetylene, Polymer chemistry, Materials Chemistry, Thermal stability, Diphenylacetylene, Curing (chemistry)
Abstract

Two kinds of novel compounds, diphenylacetylene diphenyl ether (DPADPE) and diacetylene diphenyl ether (DADPE), were prepared and polymerized under heating. Raman, DSC and 13C CP/MAS NMR analyses were used for studying the polymerization reaction. DPADPE and DADPE have melting points at 190 and 79 °C, with exothermic peaks of the DSC curves at 375 and 215 °C for curing, respectively. Raman and 13C CP/MAS NMR spectra show that DPADPE could be cured at a temperature higher than 300 °C and DADPE at a lower temperature of higher than 150 °C. The kinetic parameters for the thermal crosslinking reactions were obtained by the Ozawa method and the results show that the apparent activation energy is 152 kJ mol−1 for DPADPE and 109 kJ mol−1 for DADPE. An ene–yne Straus product appears in the cured DADPE, whereas this product has not been identified in the cured DPADPE. The cured DPADPE and DADPE demonstrate good thermal and thermo-oxidative stability. Copyright © 2006 Society of Chemical Industry

Published
2006

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